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An electric heater has a resistance of 50\(\Omega\). When it is immersed in water and...

Physics
WAEC 2013

An electric heater has a resistance of 50\(\Omega\). When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings

  • A. 4200J
  • B. 1600J
  • C. 24000J
  • D. 96000J
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Correct Answer: Option D
Explanation

Q = \(I^2RT\)

= \(4^2\) x 50 x 2 x 60

= 96000J

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